[ausev] Going in Reverse?

[Sarah & Erik]

I'll add the caveat that it's ok to do reverse a DC motor at low speed
and low power, but it will cause trouble at high speed or high power.

Erik

On Dec 20, 2007 11:07 AM, Rob H <rob at zehicle.com> wrote:
> I've wrote a post about clutchless if you have questions.  See RAVolt.com
>
> According to EV America, the brush timing in an Advanced DC motor is
> specifically setup for EVs to only go in 1 direction.  Reversing the motor
> is a bad idea.  I won't restate that AC is different.
>
>
>
> On Dec 20, 2007 7:39 AM, <kenscircus at aol.com> wrote:
> > Hi John,
> >
> > With electric you don't "need" a clutch. That is because the motor
> > doesn't idle, so the transmission input shaft is not spinning when you
> > are stopped. You just stop and slip it in reverse. Just don't try to
> > put it in reverse while in motion.
> >
> > It is also possible to reverse the motor, but if you have a manual
> > transmission I would go with that. Reversing the motor requires
> > reversing the field winding polarity. That is done with four
> > contactors. The down side of that is extra high power parts and motor
> > brush timing issues.
> >
> > Ken
> >
> >
> >
> >
> >
> > -----Original Message-----
> > From: loopcat < loopcat at yahoo.com>
> > To: ausev at austinev.org
> > Sent: Wed, 19 Dec 2007 11:07 pm
> > Subject: [ausev] Going in Reverse?
> >
> >
> >
> > Hello All,
> > Here is a real newbie question for u. If I use a
> > manual transmission without the clutch, how is it
> > possible to shift to reverse? I have see some
> > conversions that use a electric switch to control
> > direction, Is the direction changed by the
> > motor-controller?
> >
> > Thanks, John in SA
> > PS Happy Holidays!
> >
> >
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> Rob
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